linux-kernel - Re: [PATCH 6/6] drm/meson: add support for MIPI-DSI transceiver

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Date:   Wed, 12 Jan 2022 09:19:35 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     daniel@...ll.ch, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 6/6] drm/meson: add support for MIPI-DSI transceiver

Hi,

On 12/01/2022 08:24, Jagan Teki wrote:
> Hi Neil,
> 
> On Mon, Sep 7, 2020 at 1:48 PM Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> The Amlogic AXg SoCs embeds a Synopsys DW-MIPI-DSI transceiver (ver 1.21a), with a custom
>> glue managing the IP resets, clock and data input similar to the DW-HDMI Glue on other
>> Amlogic SoCs.
>>
>> This adds support for the Glue managing the transceiver, mimicing the init flow provided
>> by Amlogic to setup the ENCl encoder, the glue, the transceiver, the digital D-PHY and the
>> Analog PHY in the proper way.
>>
>> The DW-MIPI-DSI transceiver + D-PHY are directly clocked by the VCLK2 clock, which pixel clock
>> is derived and feeds the ENCL encoder and the VIU pixel reader.
>>
>> An optional "MEAS" clock can be enabled to measure the delay between each vsync feeding the
>> DW-MIPI-DSI transceiver.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---

[..]

>> +
>> +static const struct component_ops meson_dw_mipi_dsi_ops = {
>> +       .bind   = meson_dw_mipi_dsi_bind,
>> +       .unbind = meson_dw_mipi_dsi_unbind,
>> +};
> 
> Do you thought of non-component based meson DSI like STM DSI? It
> require changes from meson drm but just to understand if you have any
> such plan.

I have no such plans for now, note this serie has been rewritten at [1] but still
with based with components.

If worth it, the plan is to get it with components and than yes if it's simpler
drop components completely.

I'll have a look at how ST does

Neil

[1] https://lore.kernel.org/r/20220107145515.613009-1-narmstrong@baylibre.com

> 
> Thanks,
> Jagan.
>